Pre-cooling device and whole pulse tube refrigerator

Abstract

The utility model relates to the technical field of profound hypothermia, and provides a precooling device and a whole pulse tube refrigerator, the precooling device comprises a first cooling module used for cooling a compressor, the first cooling module comprises a first support base and a plurality of cooling blocks, the plurality of cooling blocks wrap the periphery of the compressor, and liquid nitrogen is stored in the cooling blocks; the first supporting base is arranged at the bottom of the cold block and used for fixing the cold block and insulating the cold block and the vacuum box. The second cooling module is used for cooling the hot end flange and the phase modulation mechanism, the second cooling module comprises a liquid nitrogen tank and a second supporting base, the liquid nitrogen tank is used for cooling the hot end flange and the phase modulation mechanism, and the second supporting base is used for insulating heat of the liquid nitrogen tank and the vacuum box. According to the utility model, the whole pulse tube refrigerator can be pre-cooled to a liquid nitrogen temperature zone, and the laser displacement sensor can monitor the running state of the compressor.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of cryogenic technology, especially to a precooling device and pulse tube refrigerator complete machine. BACKGROUND

[0002] High frequency pulse tube refrigerator can keep low vibration, low interference, no wear and long service life due to no moving parts at low temperature end, and these remarkable advantages make high frequency pulse tube refrigerator become ideal choice of space refrigerator in recent years, and high frequency pulse tube refrigerator is widely applied in fields such as remote sensing detection and space science. With the rapid development of space exploration, high frequency pulse tube refrigerator and its main driving source linear compressor need to face more severe space environment, and the reduction of space heat dissipation temperature also tests the operation stability of linear compressor.

[0003] At present, high frequency pulse tube refrigerator complete machine under low temperature heat dissipation temperature is less researched, with the rapid development of high temperature superconducting material, the superconducting transition temperature of part of high temperature superconducting material is higher than liquid nitrogen temperature zone, and it is a big research focus of high frequency pulse tube refrigerator to apply superconducting material to linear compressor, realize stable operation of motor in superconducting state and reduce input power of compressor. Therefore, it is necessary to study high frequency pulse tube refrigerator directly operated in liquid nitrogen temperature zone for improving refrigerator efficiency.

[0004] In prior art, the compressor, hot end flange and phase modulation mechanism of pulse tube refrigerator are immersed in liquid nitrogen. However, laser displacement sensor needs to be placed on both sides of the compressor for monitoring piston displacement parameters of the compressor. The emitted laser passes through the glass window of the liquid nitrogen storage container, liquid nitrogen, glass window on both sides of the compressor and reaches the piston to measure the displacement of the piston. However, the compressor releases heat during operation, so liquid nitrogen may boil when cooling the compressor, and the refractive index of laser in glass and liquid nitrogen is different, so the laser displacement sensor has large measurement error. Therefore, the liquid nitrogen immersion method cannot monitor the piston displacement and other data of the compressor. UTILITY MODEL CONTENTS

[0005] The utility model provides a precooling device and pulse tube refrigerator complete machine to solve the defect that displacement and other parameters of the compressor cannot be monitored by using liquid nitrogen immersion method in prior art, realize close contact with the pulse tube refrigerator complete machine, achieve good precooling effect, ensure that the refrigerator complete machine operates in liquid nitrogen temperature zone, and since the laser displacement sensor is not directly immersed in liquid nitrogen, the displacement parameters of the compressor can be monitored.

[0006] The utility model provides a precooling device for cooling pulse tube refrigerator, and the precooling device is arranged in a vacuum box and comprises:

[0007] A first cooling module for cooling the compressor, the first cooling module comprising a first support base and a plurality of cold blocks, the plurality of cold blocks being wrapped around the outer periphery of the compressor, and the cold blocks having liquid nitrogen stored therein; the first support base being disposed at the bottom of the cold blocks, and the first support base being used for fixing the cold blocks and insulating the cold blocks and the vacuum box;

[0008] A second cooling module for cooling the hot-end flange and the phase modulation mechanism, the second cooling module comprising a liquid nitrogen tank and a second support base, the liquid nitrogen tank being used for cooling the hot-end flange and the phase modulation mechanism, and the second support base being used for insulating the liquid nitrogen tank and the vacuum box;

[0009] A liquid nitrogen delivery pipe, one end of the liquid nitrogen delivery pipe being connected with the liquid nitrogen Dewar, and the other end of the liquid nitrogen delivery pipe penetrating through the side wall of the vacuum box and being connected with the cold blocks and the liquid nitrogen tank respectively.

[0010] According to the pre-cooling device provided by the utility model, the liquid nitrogen delivery pipe comprises a metal hose, a liquid nitrogen sleeve pipe and a plurality of bellows, the liquid nitrogen sleeve pipe comprises an inner pipe and an outer pipe, the liquid nitrogen Dewar is connected to an adapter head through the metal hose and enters the inner pipe, the inner pipe and the outer pipe are both welded to an adapter flange, and the outer pipe is fixed to the vacuum box; the inner pipe is sleeved in the outer pipe; the inner pipe is provided with a plurality of outlets, and each outlet is connected with a bellow; and the bellows are connected with the liquid nitrogen inlets of the first cooling module and the second cooling module.

[0011] According to the pre-cooling device provided by the utility model, the liquid nitrogen sleeve pipe and the metal hose are sealed by a ball head; the bellows, the liquid nitrogen sleeve pipe, the first cooling module and the second cooling module are all sealed by a ball head; and the adapter flange and the vacuum box and the outer pipe and the vacuum box are both sealed by a sealing ring.

[0012] According to the pre-cooling device provided by the utility model, the second cooling module further comprises a cold screen, the cold screen is arranged on the inner side of the second support base, and the cold screen is fixed to the hot-end flange.

[0013] According to the pre-cooling device provided by the utility model, the cold blocks comprise four cold blocks, and the cold blocks are paired, and each pair of cold blocks is provided with a receiving hole corresponding to the compressor on the opposite side.

[0014] According to the pre-cooling device provided by the utility model, the first support base comprises:

[0015] A pair of support plates are arranged on the two sides of the bottom of the cold blocks.

[0016] A heat insulation plate is arranged at the bottom of the support plate, and the heat insulation plate is used for heat insulation between the cold block and the vacuum box.

[0017] According to the pre-cooling device, the heat insulation plate is a Teflon plate.

[0018] According to the pre-cooling device, the phase adjusting mechanism comprises a gas reservoir and an inertia pipe, the side surface of the liquid nitrogen tank is provided with an open slot with a round corner, the open slot is used for the inertia pipe to pass out, and the inertia pipe spirals on the outer periphery of the liquid nitrogen tank and is connected with the gas reservoir.

[0019] According to the pre-cooling device, the gas reservoir is a waist-shaped hole gas reservoir, is fixed at the top of the liquid nitrogen tank, and is in contact with the liquid nitrogen tank through pre-tightening force.

[0020] The pre-cooling device is used for cooling the pulse tube refrigerator, the first cooling module comprises a first support base and a plurality of cold blocks, the plurality of cold blocks are wrapped on the outer periphery of the compressor, the inside of the cold block is stored with liquid nitrogen, the first support base is arranged at the bottom of the cold block, and the first support base is used for fixing the cold block and heat insulation between the cold block and the vacuum box; the liquid nitrogen tank is used for cooling the hot end flange and the phase adjusting mechanism, the second support base is used for heat insulation between the liquid nitrogen tank and the vacuum box, the whole pulse tube refrigerator can be pre-cooled to the liquid nitrogen temperature zone, the laser displacement sensor can monitor the running state of the compressor, and in addition, the existence of the vacuum environment makes the whole pulse tube refrigerator have less heat leakage.

[0021] The pulse tube refrigerator provided by the utility model is characterized in that the pre-cooling device is used for cooling the pulse tube refrigerator body, and the running state of the compressor can be monitored at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0023] Figure 1 It is the structure schematic view of the pre-cooling device provided by the utility model embodiment.

[0024] Figure 2 It is the sectional view of the first cooling module provided by the utility model embodiment.

[0025] Figure 3 It is the sectional view of the second cooling module provided by the utility model embodiment.

[0026] Figure 4 is a sectional view of the liquid nitrogen conveying pipe provided by the embodiment of the present application.

[0027] Figure 5 is another angle structural schematic view of the pre-cooling device provided by the embodiment of the present application.

[0028] Reference signs:

[0029] 1, first cooling module; 11, first support base; 12, cold block; 2, second cooling module; 21, liquid nitrogen tank; 22, second support base; 23, cold screen; 3, vacuum box; 4, liquid nitrogen conveying pipe; 41, inner tube; 42, outer tube; 5, hot end flange; 6, gas library; 7, open slot. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In the description of the embodiments of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0032] The pre-cooling device of the present application will be described below in combination with Figures 1-5 The pre-cooling device of the present application will be described below in combination with

[0033] Referring to Figure 1 The pre-cooling device provided by the embodiment of the present application is used for cooling a pulse tube refrigerator, and is arranged in a vacuum box 3 and comprises a first cooling module 1 and a second cooling module 2.

[0034] Referring to Figure 2As shown, the first cooling module 1 is used for cooling the compressor, the first cooling module 1 comprises a first support base 11 and a plurality of cold blocks 12, the plurality of cold blocks 12 are wrapped around the outer periphery of the compressor, so that the plurality of cold blocks 12 are fixed from the side of the compressor, and screws can be screwed to ensure that the cold blocks 12 are in close contact with the compressor. The inside of the cold block 12 stores liquid nitrogen, and the liquid nitrogen is used as a cooling medium, and the extremely low temperature of the liquid nitrogen can rapidly cool the compressor. The first support base 11 is arranged at the bottom of the cold block 12, and the first support base 11 is used for supporting and fixing the cold block 12 on the one hand to prevent the cold block 12 from sliding, and is used for heat insulation between the cold block 12 and the vacuum box 3 on the other hand.

[0035] Wherein, in order to improve the cold conduction system, the cold block 12 can adopt a hollow device supported by copper material.

[0036] As shown in the accompanying drawings, Figure 3 As shown, the second cooling module 2 is used for cooling the hot end flange 5 and the phase modulation mechanism, the second cooling module 2 comprises a liquid nitrogen tank 21 and a second support base 22, the liquid nitrogen tank 21 is used for cooling the hot end flange 5 and the phase modulation mechanism, and the hot end flange 5 and the phase modulation mechanism are prone to accumulate heat in the pulse tube refrigerator. Through the direct cooling of the liquid nitrogen, the temperature of these components can be significantly reduced. The second support base 22 is used for heat insulation between the liquid nitrogen tank 21 and the vacuum box 3.

[0037] The first support base 11 and the second support base 22 not only provide stable support for the cold block 12 and the liquid nitrogen tank 21, but also play a heat insulation role. Through effective heat insulation design, the low temperature of the cold block 12 and the liquid nitrogen tank 21 can be prevented from causing adverse effects on the components inside the vacuum box 3, and the interference of external heat on the cooling module is avoided, so that the stability and durability of the cooling effect are ensured.

[0038] The pre-cooling device provided by the utility model has the advantages that through the above structure, liquid nitrogen is stored in the hollow device made of copper material, the pre-cooling device is in close contact with the cooled pulse tube refrigerator, good pre-cooling effect can be achieved, and the whole refrigerator is ensured to operate in the liquid nitrogen temperature zone. On the one hand, the laser displacement sensor for measuring the displacement parameter of the compressor can emit laser to the piston of the compressor for monitoring without passing through the liquid nitrogen; on the other hand, the whole pre-cooling device is placed in the vacuum box 3, liquid nitrogen is introduced into the pre-cooling device, the environment temperature of the refrigerator is finally near 80K, and the existence of the vacuum environment makes the whole pulse tube refrigerator have less heat leakage.

[0039] Again refer to the accompanying drawings, Figure 2 And Figure 3As shown, in a feasible embodiment of the present application, in order to pass liquid nitrogen from the dewar to the liquid nitrogen tank 21 and the cold block 12, a liquid nitrogen delivery pipe 4 is further included, one end of the liquid nitrogen delivery pipe 4 is connected with the liquid nitrogen dewar, and the other end of the liquid nitrogen delivery pipe 4 penetrates through the side wall of the vacuum box 3 and is connected with the cold block 12 and the liquid nitrogen tank 21 respectively. Plug-in male and female joints can be used, and sealing devices in the form of clamp locking or flange locking are provided to ensure the stability and sealing performance of the connection. The liquid nitrogen delivery pipe 4 is designed with high-vacuum insulation, which can effectively reduce the heat loss of liquid nitrogen during transmission and improve the transmission efficiency.

[0040] In a feasible embodiment of the present application, the cold block 12 includes four, and the cold blocks 12 are paired, which not only improves the cooling effect, but also ensures the stability and reliability of the system. Each pair of cold blocks 12 is provided with a containing hole corresponding to the compressor on the opposite side, and the cold blocks 12 can be closely attached to the compressor, thereby more effectively performing heat exchange. The cold blocks 12 rapidly transmit the heat generated by the compressor through their good heat conduction performance, thereby ensuring the normal operation of the compressor.

[0041] In a feasible embodiment of the present application, the first support base 11 includes a pair of support plates and an insulation plate (not shown in the figure), the pair of support plates are respectively arranged on the two sides of the bottom of the cold block 12, and the pair of support plates fix the four cold blocks 12 to prevent left and right sliding. The insulation plate is arranged at the bottom of the support plate, and the insulation plate is used to insulate the cold block and the vacuum box.

[0042] The insulation plate is a Teflon plate, and the Teflon plate has an extremely low thermal conductivity, so the Teflon plate has excellent heat insulation performance and can effectively reduce heat transfer and improve cooling efficiency.

[0043] More specifically, the liquid nitrogen delivery pipe 4 includes a metal hose, a liquid nitrogen sleeve and a plurality of corrugated pipes (not shown in the figure), as Figure 4 As shown, the liquid nitrogen sleeve includes an inner tube 41 and an outer tube 42, the liquid nitrogen dewar is connected to the adapter through the metal hose and enters the inner tube 41, the inner tube 41 and the outer tube 42 are both welded to the adapter flange, and the outer tube 42 is fixed to the vacuum box 3; the inner tube 41 is sleeved in the inner tube 42; the inner tube 41 passes through the inner tube 42 without contacting the inside of the vacuum box 3, thereby reducing the influence on the wall temperature of the vacuum box 3. When the vacuum is drawn for the experiment, the air between the inner tube 41 and the outer tube 42 of the liquid nitrogen sleeve is drawn away through the reserved gap. The outer tube 42 is longer to reduce the influence of the liquid nitrogen passing through the outer tube 42 on the vacuum box 3 as much as possible.

[0044] Further, the inner tube 41 has a plurality of outlets, and each outlet is connected with a corrugated pipe corresponding to the liquid nitrogen inlet of the first cooling module 1 and the second cooling module 2. The liquid nitrogen jacket pipe to the cold block 12 and the liquid nitrogen tank 21 is transported through the corrugated pipe, and since the liquid nitrogen needs to be supplied to the cold block 12 and the liquid nitrogen tank 21 at the same time, two pipes are branched out at the outlet of the inner tube 41, one of which is directly connected to the liquid nitrogen inlet of the liquid nitrogen tank 21, and the other pipe is connected to the liquid nitrogen inlet of the cold block 12. However, since the first cooling module 1 includes four cold blocks 12, the pipe needs to be connected to a five-way pipe through a corrugated pipe, and then four pipes are branched out, and then the four pipes are connected to the liquid nitrogen inlets of the four cold blocks 12.

[0045] It should be noted that the liquid nitrogen discharge route is also arranged in this way, and when connecting the corrugated pipe, the wall surface of the vacuum box 3 cannot be touched.

[0046] When the liquid nitrogen is tested, the test device must be isolated from the air during the process of cooling from room temperature to the vicinity of the liquid nitrogen temperature, otherwise the water vapor in the air will freeze when it is cold, so the design of the vacuum seal must be good when transporting the liquid nitrogen. The sealing ring structure at room temperature loses its effect at liquid nitrogen temperature, so in a feasible embodiment of the utility model, the liquid nitrogen jacket pipe is welded and sealed, and the liquid nitrogen jacket pipe and the metal hose are sealed by a ball head; the corrugated pipe and the liquid nitrogen jacket pipe, the corrugated pipe and the first cooling module 1, and the corrugated pipe and the second cooling module 2 are all sealed by a ball head; the adapter flange and the vacuum box 3, and the outer tube 42 and the vacuum box 3 are all sealed by a sealing ring.

[0047] Referring again to Figure 3 In a feasible embodiment of the utility model, the second cooling module 2 further includes a cold screen 23, the cold screen 23 is arranged on the inner side of the second support base 22, and the cold screen 23 is in contact with the hot end flange 5, and the cold screen 23 is used to reduce the radiation heat exchange of the cold finger.

[0048] Referring to Figure 5 In a feasible embodiment of the utility model, the phase modulation mechanism includes an air tank 6 and an inertia pipe, and the side of the liquid nitrogen tank 21 is provided with an open groove 7 with a round corner, and the round corner is at a certain angle, so that the inertia pipe can be safely coiled (if the open groove is a right angle, the inertia pipe may be damaged when coiled). In order to facilitate sealing and replacement of the inertia pipe in the later period, the inertia pipe is connected by welding between each section, and the inertia pipe is coiled on the outer periphery of the liquid nitrogen tank 21 and connected with the air tank 6.

[0049] The gas reservoir 6 is fixed on the top of the liquid nitrogen tank 21, and is a waist-shaped hole gas reservoir, which is arranged to rotate the waist-shaped hole gas reservoir to make the inertia tube more tightly when the inertia tube is not tightly coiled on the liquid nitrogen tank, and then the gas reservoir is fixed on the liquid nitrogen tank 21. In addition, the gas reservoir 6 is in full contact with the liquid nitrogen tank 21 through the pre-tightening force of the screw, and the inertia tube can be slightly rotated to be more tightly attached to the wall surface of the liquid nitrogen tank 21 during fixing.

[0050] The pre-cooling device provided by the embodiment of the utility model can better evaluate the parameter changes of the compressor in the refrigerant operation process, and provides conditions for designing and testing low-temperature compressor components.

[0051] In the description of the embodiments of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0052] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "way", "specific way" or "some ways" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or way are included in at least one embodiment or way of the embodiments of the utility model. In the specification, the illustrative description of the above terms is not necessarily for the same embodiment or way. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or ways in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or characteristics of the different embodiments or ways described in the specification without contradiction.

[0053] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A precooling device for cooling a pulse tube refrigerator, the precooling device being disposed inside a vacuum chamber, characterized in that, include: The first cooling module (1) is used to cool the compressor. The first cooling module (1) includes a first support base (11) and a plurality of cold blocks (12). The plurality of cold blocks (12) cover the outer periphery of the compressor, and the interior of the cold blocks (12) stores liquid nitrogen. The first support base (11) is disposed at the bottom of the cold blocks (12), and the first support base (11) is used to fix the cold blocks (12) and insulate the cold blocks (12) and the vacuum box (3). The second cooling module (2) is used to cool the hot end flange (5) and the phase adjustment mechanism. The second cooling module (2) includes a liquid nitrogen tank (21) and a second support base (22). The liquid nitrogen tank (21) is used to cool the hot end flange (5) and the phase adjustment mechanism. The second support base (22) is used to insulate the liquid nitrogen tank (21) and the vacuum box (3). A liquid nitrogen delivery pipe (4) is provided, one end of which is connected to a liquid nitrogen Dewar, and the other end of which passes through the side wall of the vacuum chamber (3) and is connected to the cold block (12) and the liquid nitrogen tank (21) respectively.

2. The precooling device according to claim 1, characterized in that, The liquid nitrogen delivery pipe (4) includes a metal hose, a liquid nitrogen sleeve, and multiple corrugated pipes. The liquid nitrogen sleeve includes an inner tube (41) and an outer tube (42). The liquid nitrogen Dewar is connected to the adapter through the metal hose and enters the inner tube (41). The inner tube (41) and the outer tube (42) are both welded to the adapter flange. The outer tube (42) is fixed to the vacuum box (3). The inner tube (41) is sleeved inside the outer tube (42). The inner tube (41) has multiple outlets, and each outlet is connected to a corrugated pipe. The corrugated pipe is connected to the liquid nitrogen inlet of the first cooling module (1) and the second cooling module (2).

3. The precooling device according to claim 2, characterized in that, The liquid nitrogen sleeve and the metal hose are sealed by a ball joint; the corrugated pipe and the liquid nitrogen sleeve, the corrugated pipe and the first cooling module (1), and the corrugated pipe and the second cooling module (2) are all sealed by a ball joint; the adapter flange and the vacuum box (3), and the outer pipe (42) and the vacuum box (3) are all sealed by a sealing ring.

4. The precooling apparatus according to any one of claims 1-3, characterized in that, The second cooling module (2) also includes a cold screen (23), which is disposed on the inner side of the second support base (22) and fixed to the hot end flange (5).

5. The precooling device according to claim 1, characterized in that, The cold blocks (12) include four, and the cold blocks (12) are paired up. Each pair of cold blocks (12) has a receiving hole on the opposite side that corresponds to the compressor.

6. The precooling device according to claim 5, characterized in that, The first support base (11) includes: A pair of support plates are respectively disposed on both sides of the bottom of the cold block (12); A heat insulation plate is disposed at the bottom of the support plate, and the heat insulation plate is used to insulate the cold block (12) and the vacuum box (3).

7. The precooling device according to claim 6, characterized in that, The heat insulation board is made of PTFE.

8. The precooling device according to claim 1, characterized in that, The phase adjustment mechanism includes a gas reservoir (6) and an inertial tube. The side of the liquid nitrogen tank (21) is provided with an opening groove (7) with rounded corners. The opening groove (7) allows the inertial tube to pass through, and the inertial tube is coiled around the outer periphery of the liquid nitrogen tank (21) and connected to the gas reservoir (6).

9. The precooling device according to claim 8, characterized in that, The gas reservoir (6) is a waist-shaped gas reservoir, fixed to the top of the liquid nitrogen tank (21), and the gas reservoir (6) is brought into contact with the liquid nitrogen tank (21) by a pre-tightening force.

10. A complete pulse tube refrigerator, characterized in that, include: The pulse tube refrigerator body and the precooling device as described in any one of claims 1-9, wherein the precooling device is used to cool the pulse tube refrigerator body.

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